Washington Redskins Tight End Fred Davis -- You Can't Sue Me Twice Over Nightclub Attack

Washington Redskins tight end Fred Davis is firing back against the woman who sued him for assaulting her in a nightclub in 2011 ... then sued him AGAIN for defamation this year ... claiming she can't sue him twice over the same incident.

TMZ broke the story ... a female clubgoer named Makini Chaka accused Davis of throwing a drink at her in a D.C. nightclub back in 2011, and then striking her in the lip with a champagne bottle. She sued over her injuries and emotional distress and won $19,761 in court.

But the legal war didn't end there: Chaka (who runs a company that procures celebrities for events) has filed a NEW lawsuit ... this time for defamation ... claiming Fred has been badmouthing her around town in the wake of her original lawsuit.

Chaka says Davis has started rumors that she actually runs a prostitution ring, calling her things like a "pimp, pimpette, and/or madam."

Fred isn't about to pony up extra cash though ... he just filed a legal response, telling Chaka to buzz off.